package cn.com.sr.commonj.encrypt.jdk;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class AESUtil {
	/**
	 * 加密
	 * 
	 * @param content 需要加密的内容
	 * @param password 加密密码
	 * @return
	 */
	public static byte[] encrypt(String content, String password, String charset) {
		try {
			byte[] byteContent = content.getBytes(charset);
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			/*
			 * SecureRandom 实现完全随操作系统本身的內部状态，除非调用方在调用 getInstance 方法之后又调用了 setSeed 方法；
			 * 该实现在 windows 上每次生成的 key 都相同，但是在 solaris 或部分 linux 系统上则不同。
			 */
			//kgen.init(128, new SecureRandom(password.getBytes()));
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(password.getBytes());
			kgen.init(128, secureRandom);

			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec realKey = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器 

			cipher.init(Cipher.ENCRYPT_MODE, realKey);// 初始化 
			byte[] result = cipher.doFinal(byteContent);
			return result; // 加密 
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static byte[] encrypt(String content, String password) {
		return encrypt(content, password, "utf-8");
	}

	/**
	 * 解密
	 * 
	 * @param content 待解密内容
	 * @param password 解密密钥
	 * @return
	 */
	public static String decrypt(byte[] content, String password, String charset) {
		try {
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			/*
			 * SecureRandom 实现完全随操作系统本身的內部状态，除非调用方在调用 getInstance 方法之后又调用了 setSeed 方法；
			 * 该实现在 windows 上每次生成的 key 都相同，但是在 solaris 或部分 linux 系统上则不同。
			 */
			//kgen.init(128, new SecureRandom(password.getBytes()));
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(password.getBytes());
			kgen.init(128, secureRandom);

			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec realKey = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器 
			cipher.init(Cipher.DECRYPT_MODE, realKey);// 初始化 
			byte[] decryptResult = cipher.doFinal(content);

			String result = new String(decryptResult, charset);

			return result; // 加密 
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static String decrypt(byte[] content, String password) {
		return decrypt(content, password, "utf-8");
	}

	/**
	 * 将二进制转换成16进制
	 * 
	 * @param buf
	 * @return
	 */
	public static String parseByte2HexStr(byte buf[]) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < buf.length; i++) {
			String hex = Integer.toHexString(buf[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			sb.append(hex.toUpperCase());
		}
		return sb.toString();
	}

	/**
	 * 将16进制转换为二进制
	 * 
	 * @param hexStr
	 * @return
	 */
	public static byte[] parseHexStr2Byte(String hexStr) {
		if (hexStr.length() < 1)
			return null;
		byte[] result = new byte[hexStr.length() / 2];
		for (int i = 0; i < hexStr.length() / 2; i++) {
			int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
			int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
			result[i] = (byte) (high * 16 + low);
		}
		return result;
	}

	/**
	 * 加密
	 *
	 * @param content 需要加密的内容
	 * @param password 加密密码
	 * @return
	 */
	public static byte[] encrypt2(String content, String password, String charset) {
		try {
			byte[] byteContent = content.getBytes(charset);

			SecretKeySpec key = new SecretKeySpec(password.getBytes(), "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");

			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化 
			byte[] result = cipher.doFinal(byteContent);
			return result; // 加密 
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void main(String[] args) {
		String content = "张三是猪头111Test";
		String key = "apexsoft";
		//加密 
		System.out.println("加密前：" + content);
		byte[] encryptResult = encrypt(content, key, "utf-8");
		String encryptResultBase64 = parseByte2HexStr(encryptResult);
		System.out.println("加密后：" + encryptResultBase64);

		//解密 
		byte[] needDncryptResult = parseHexStr2Byte(encryptResultBase64);
		String decryptResult = decrypt(needDncryptResult, key, "utf-8");
		System.out.println("解密后：" + decryptResult);
	}
}
